Iterate through all dynamic text variables

Hello,
I'd like to be able to iterate through all of the dynamic
text variables in my flash movie, and I'd like it so that if I add
new text to this movie, it will show up in the iteration.
Essentially, I want to do something like this:
for (i in _root) {
trace(i);
While this seems to print out all the variables in root, it
prints more than just the dynamic text variables, and also doesn't
iterate down through various objects to find the dynamic text
variable.
Is there any way I can accomplish this in action script?
Thanks!

Great! That code helps me a lot.
There are still two weird issues.
1) the test for tl[obj].text seems to always turn out to be
false. However, if I trace the value of text, I'll see the text.
Example:
trace(tl[obj].text); // This will display the value in the
text field
if (tl[obj].text) // This is always returning false.
Any ideas?
The 2nd issue might be more difficult - some of my text
objects don't appear until later in the movie (i.e. frame 10). It
sort of looks like this looping doesn't see objects that appear in
the future. Do I need to advance the frame 1 by 1 and repeat this
looping process until the text appears? Maybe instead I can always
have the text in the first frame, but have it be invisible or
something?

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